This link should help - has % of the company owned by visium as of end Q1 http://whalewisdom.com/filer/visium-asset-management-llc#/tabholdings_tab_link The numbers should probably be adjusted by about a third lower based on redemption requests in march after the probe was made public: http://www.wsj.com/articles/clients-ask-to-pull-1-5-billion-from-visium-asset-management-1462393928